/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.nacos.security.nacos;

import com.alibaba.nacos.security.nacos.users.NacosUserDetailsServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;

/**
 * auth provider.
 *
 * @author 朱耀威
 */
@Component
public class CustomAuthenticationProvider implements AuthenticationProvider {

	@Autowired
	private NacosUserDetailsServiceImpl userDetailsService;

	@Override
	public Authentication authenticate(Authentication authentication) throws AuthenticationException {

		String username = (String) authentication.getPrincipal();
		String password = (String) authentication.getCredentials();
		UserDetails userDetails = userDetailsService.loadUserByUsername(username);

		if (!password.equals(userDetails.getPassword())) {
			return new UsernamePasswordAuthenticationToken(username, null, null);
		}
		return null;
	}

	@Override
	public boolean supports(Class<?> aClass) {
		return aClass.equals(UsernamePasswordAuthenticationToken.class);
	}

}
